1261314618799 has 2 divisors, whose sum is σ = 1261314618800. Its totient is φ = 1261314618798.

The previous prime is 1261314618793. The next prime is 1261314618827. The reversal of 1261314618799 is 9978164131621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261314618799 - 2³ = 1261314618791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261314618791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630657309399 + 630657309400.

It is an arithmetic number, because the mean of its divisors is an integer number (630657309400).

Almost surely, 2^{1261314618799} is an apocalyptic number.

1261314618799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261314618799 is an equidigital number, since it uses as much as digits as its factorization.

1261314618799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The spelling of 1261314618799 in words is "one trillion, two hundred sixty-one billion, three hundred fourteen million, six hundred eighteen thousand, seven hundred ninety-nine".